近震作用下单自由度结构的非弹性响应分析研究

通过选择几条典型的脉冲型近震记录 ,已发现近震脉冲特性对单自由度结构基底剪力、顶部位移和延性需求的影响。为了全面地反映近震作用对单自由度结构非弹性位移响应的影响 ,笔者以结构的非弹性位移比作为指标 ,通过选取大量的近震和远震记录 ,研究了近场地面运动参数对理想弹塑性单自由度结构非弹性位移比的影响 ,着重分析了不同类型、不同程度退化效应和不同场地条件对结构非弹性位移比的影响 ,并与远震作用计算结果进行了对比分析 ,得出了一些重要的结论。

Inelastic Response Analysis for the SDOF Structures Under Near-field Earthquakes

The effects of near-field seismic pulse on base shear, roof displacement and ductility demand of the SDOF structures are analyzed by choosing some typical near-field pulse-like earthquakes. In order to reflect the effects of near-field earthquakes on the inelastic displacement response of the SDOF structures, the inelastic displacement ratio is used to estimate the inelastic structural displacement response under the intense earthquakes. By choosing large amounts of near-field and far-field seismic records, the effects of various parameters of near-field ground motions on the inelastic displacement ratio of elastoplastic SDOF structures are analyzed, and the emphasis is put on the analysis of the effects of various degrading characteristics and different soil types on the structural inelastic displacement ratio, and the comparison of the calculated results with those under the far-field earthquakes. Finally some important conclusions are drawn.